<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
//URL=全部
//server ip+port 域名+端口
//URI=coontextpath+servletpath
//contextpath 工程路径
//servletpath 问号之前
//queryString 
<%=request.getRequestURL() %></br>
<%=request.getRequestURI() %></br>
<%=request.getServerName() %></br>
<%=request.getServerPort() %></br>
<%=request.getServletPath() %></br>
<%=request.getServletContext() %></br></br>

<%=application.getRealPath(request.getRequestURI()) %></br>
<%=application.getRealPath("/") %></br>
<%=application.ge %>

</body>
</html>